Bicycle frame bottom bracket



FIG. 1 is a top, right side perspective view of a bicycle frame bottom bracket;

FIG. 2 is a right side view of a bicycle frame bottom bracket;

FIG. 3 is a left side view of a bicycle frame bottom bracket; and,

FIG. 4 is a bottom view of a bicycle frame bottom bracket.

The broken, dashed lines shown in the various figures are included for the purpose of illustrating environment and do not form any part of the claimed design. 

CLAIM The ornamental design for bicycle frame bottom bracket, as shown and described. 